Since a 4K resolution video consume a lot of storage space, Apple's 16 GB iPhone 6S and 6S Plus offer very less disk space for recording 4K videos. According to a report from Phone Arena, the iOS 9 occupies huge storage space and leaves around 12 GB for storing user data. Moreover, installation of apps and games further cuts down the space available for storing photos and videos shot through the handset's 12-megapixel iSight camera.

Both the new iPhone 6S handsets can shoot videos with different resolutions like 720 pixels, 1080 pixels and 4K pixels resolution. A minute video of 720 pixels at 30 fps consumes 60 MB of storage space. A minute long full HD video at 30 fps and 60 fps consumes 130 MB and 200 MB storage space. A 4K resolution video of one minute at 30 fps eats up 375 MB of storage space.

Hence, users can record a 720 pixels video at 30 fps with a maximum length of 200 minutes to consume the entire 12 GB storage space. When it comes to full HD videos of 30 fps and 60 fps, users can record a video of maximum length of 92 minutes to use of fully use the 12 GB storage. Lastly, the iPhone 6S and the iPhone 6S Plus with an available storage space of 12 GB can store a single 4K resolution video of 32 minutes at 30 fps.

A report from ZD Net said that Live Photos, bigger apps and offline videos consume massive storage device. A viable solution for 16 GB iPhone 6S and 6S Plus users is to make use of the iCloud service to store their data on the cloud. The on-contract price of the 16 GB models of the iPhone 6S and iPhone 6S Plus are $199 and $299, respectively. Both the handsets carry respective off-contract price tags of $649 and $749.